Sleeve valve pipe positioning device and positioning method

Abstract

The invention belongs to the technical field of drilling engineering and engineering grouting, and particularly provides a sleeve valve pipe positioning device and method.The sleeve valve pipe positioning device comprises a sliding assembly, a fixing assembly and a connecting assembly which are arranged at intervals in the central axis direction of a sleeve valve pipe; the sliding assembly comprises a first steel mold and a second steel mold, and the first steel mold and the second steel mold are connected to form a sliding ring structure. The fixing assembly comprises two semicircular steel molds which are symmetrically arranged, and the two semicircular steel molds are connected with each other to form a fixing ring structure; the fixing ring structure is fixedly connected with the sleeve valve pipe; the two connecting assemblies are symmetrically arranged, and the sliding assembly, the fixing assembly and the two connecting assemblies are mutually connected to form a rhombus structure. Reliable positioning in the deep well descending process is achieved through quick assembly of the vertical pins and uniform compression of the elastic connecting pieces; and the detachable design of the fixing screws ensures recycling of the support, and the construction cost is reduced.

Description

TECHNICAL FIELD

[0001] The present application belongs to the field of drilling engineering and engineering grouting, and relates to a sleeve valve pipe positioning device and a positioning method. BACKGROUND

[0002] In the process of drilling, geological exploration and downhole grouting operation, it is often necessary to perform directional drilling, casing fixing or stratum reinforcement treatment on specific intervals. The central positioning support, as an important downhole auxiliary tool, is used to fix the position of the sleeve valve pipe in the borehole, prevent the sleeve valve pipe from deviating or tilting, ensure the uniform annular formation of the sleeve shell material and realize the accurate injection of slurry into the target stratum, and is a core component for realizing stable and efficient drilling operation. The traditional central positioning support is mostly of fixed or welded structure, and is positioned by contacting the well wall through mechanical buckles or external support.

[0003] However, the existing central positioning support has obvious limitations in actual application. First, in complex strata or irregular well wall conditions, the traditional support is prone to deviation of the sleeve valve pipe due to unstable support and blocked sliding, and the problem of uneven annular formation of the sleeve shell material (i.e. "annular failure") occurs, which seriously affects the uniformity of grouting and the effect of stratum reinforcement. Secondly, the installation or disassembly process of some supports is complex, and even there is a risk of being unable to quickly assemble or recover, which increases the construction period and cost. In addition, the adaptability of conventional supports to wellbore pressure is limited, and deformation or failure easily occurs under deep lowering or large pressure fluctuations, which lacks reliability.

[0004] In summary, although the industry has made some improvements to the structure and materials of the central positioning support, such as using simple support or using annular pads, there is still room for improvement in terms of ensuring the convenience of quick disassembly and maintaining stable positioning during dynamic lowering. In particular, in deep wells, ultra-deep wells or complex geological conditions, higher requirements are placed on the assembly reliability, positioning stability and dismountability of the central positioning support. Therefore, there is an urgent need for a new type of central positioning support structure that can effectively solve the problems of easy deviation, uneven annular formation and difficult disassembly that occur in existing technologies. SUMMARY

[0005] The present application provides a sleeve valve pipe positioning device, comprising a sliding assembly and a fixed assembly arranged at intervals along the central axis direction of the sleeve valve pipe, and a connecting assembly for connecting the sliding assembly and the fixed assembly; The sliding assembly comprises a first steel mold and a second steel mold, and the first steel mold and the second steel mold are connected to each other by vertical pins, forming a sliding ring structure; The fixed assembly comprises two semicircular steel molds arranged symmetrically, and the two semicircular steel molds are connected to each other by vertical pins, forming a fixed ring structure; the fixed ring structure is fixedly connected to the sleeve valve pipe by fixed screws; The connecting components are provided in two symmetrically arranged sets. The sliding component, the fixed component, and the two sets of connecting components are connected to each other to form a rhomboid structure. Specifically, each set of connecting components includes an elastic connector and a rotating connector. There are two elastic connectors. One elastic connector has its two ends hinged to one end of the fixed component and the rotating connector, respectively. The other elastic connector has its two ends hinged to the sliding component and the rotating connector, respectively.

[0006] Furthermore, the weight of the sliding component is set to 5 kg; The vertical pins are made of high-strength steel with a shear strength of 100-200MPa; The fixing screws are made of brittle steel with a shear strength of 100-200MPa.

[0007] Furthermore, the elastic connector includes a compression spring, a metal support, and a housing; The two ends of the metal support are respectively connected to the two ends of the outer shell; The compression spring is sleeved on the metal support, and the two ends of the compression spring are respectively hinged to the sliding component, the fixed component and the rotating connector. The outer casing is fitted onto the compression spring.

[0008] Furthermore, the compression spring has a wire diameter of 1.5-2 mm, an elastic modulus of 180-200 GPa, and a compressive strength of 0.3-0.5 MPa.

[0009] Furthermore, a plurality of built-in balls are provided on the inner side of the sliding component; the plurality of built-in balls are arranged in a circumferential array along the inner wall of the sliding component.

[0010] Furthermore, the rotating connecting component includes a pulley and a rotor bearing; The rotor bearing is mounted on the pulley, and the rotor bearing is hinged to the elastic connecting member. The pulley is used for sliding connection with the well wall.

[0011] As a further aspect of the present invention, a valve tube positioning method is also provided, comprising the following steps: Step 1: Assemble the valve tube positioning device as described above and pre-position it on the outside of the valve tube; The casing and casing positioning device are lowered by the surface directional drilling rig, and the fixing component is fixed to the casing by fixing screws. At this time, the vertical pin remains intact, the small bearing restricts the rotor bearing from sliding along the metal shell, the pulley has not yet fully contacted the well wall, the compression spring is in the initial state, and the sliding component is ready to bear force by its own weight. Step 2: Continue lowering the valve tube. As the lowering depth gradually increases, the self-weight pressure of the sliding component pushes the pulley to contact the well wall. The pulley drives the sliding component to move through the rotor bearing. The sliding component pushes the compression spring to compress it. The compression spring presses against the metal support and, guided by the built-in ball bearings, adheres tightly to the well wall to form a stable support chamber. The pulley is positioned around the well wall, and the control sleeve valve pipe is located at the center axis of the drilling, thus completing the positioning.

[0012] Compared with the prior art, the present invention has the following beneficial effects: (1) The valve tube positioning device provided by the present invention achieves reliable positioning during the deep well lowering process through the rapid assembly of vertical pins and the uniform compression of elastic connectors; and the detachable design of the fixing screws ensures the recycling of the support and reduces construction costs. The entire positioning process ensures that the valve tube is located on the drilling center axis through the synergistic contact of its own weight and the rotating connectors, forming a uniform ring channel, preventing deviation or tilting, and ensuring the uniform ring formation of the casing material and the long-term stability of the formation.

[0013] (2) This invention solves the problem of instability or difficulty in disassembly / assembly during deep well lowering caused by defects in the existing central positioning support structure and process. Specifically, the vertical pin and fixing screw combination mechanism adopted in this invention can realize the rapid on-site assembly of the integrated central positioning support, which is convenient for rapid on-site assembly and application; furthermore, this invention controls the compression of the elastic connector through self-weight pressure, and the self-weight coordinates the rotation of the connector to contact the well wall, driving the sliding component to push the elastic connector to compress evenly, ensuring a tight fit with the well wall and preventing the valve tube from shifting; the high-strength structure of the elastic connector enhances rigidity and stability, and the metal support and shell provide guidance and protection, achieving reliable positioning.

[0014] In addition to the objectives, features, and advantages described above, the present invention has other objectives, features, and advantages. The invention will now be described in further detail with reference to the figures. Attached Figure Description

[0015] The accompanying drawings, which form part of this application, are used to provide a further understanding of the invention. The illustrative embodiments of the invention and their descriptions are used to explain the invention and do not constitute an undue limitation of the invention. In the drawings: Figure 1 This is a front cross-sectional view of a valve tube positioning device according to Embodiment 1 of the present invention; Figure 2 yes Figure 1 Mid-side view diagram; Figure 3 yes Figure 2 Schematic diagram of the AA section; Figure 4 yesFigure 1 A front sectional view of the valve tube fixed to the sleeve. Figure 5 yes Figure 4 A diagram showing the view from below; Figure 6 yes Figure 1 A cross-sectional schematic diagram of the sliding ring structure.

[0016] in: 1. Built-in ball bearing, 2. Sliding assembly, 3. Vertical pin, 4. Compression spring, 5. Metal support, 6. Housing, 7. Pulley, 8. Rotor bearing, 9. Small bearing, 10. Fixing screw, 11. Fixing assembly, 12. Valve sleeve, 13. Housing material filling position, 14. Drill hole outside the stratum. Detailed Implementation

[0017] To make the above-mentioned objectives, features, and advantages of the present invention clearer and easier to understand, the specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings. It should be noted that the accompanying drawings of the present invention are all in a simplified form and use non-precise proportions, and are only used to facilitate and clearly assist in illustrating the implementation of the present invention; the "several" mentioned in the present invention are not limited to the specific number shown in the examples in the accompanying drawings; the orientations or positional relationships indicated by terms such as "front," "middle," "rear," "left," "right," "up," "down," "top," "bottom," and "center" mentioned in the present invention are all based on the orientations or positional relationships shown in the accompanying drawings of the present invention, and do not indicate or imply that the device or component referred to must have a specific orientation, nor should they be construed as limitations on the present invention.

[0018] Example 1: See Figures 1 to 6 As shown, the valve tube positioning device provided by the present invention has a preset position outside the valve tube 12; the valve tube positioning device includes a sliding component 2 and a fixing component 11 arranged at intervals along the central axis of the valve tube 12, and a connecting component for connecting the sliding component 2 and the fixing component 11. The sliding component 2 includes a first steel mold and a second steel mold, which are connected to each other by vertical pins 3 to form a sliding ring structure; The fixing component 11 includes two semi-circular steel molds arranged symmetrically to each other. The two semi-circular steel molds are connected to each other by vertical pins 3 to form a fixing ring structure. The fixing ring structure is fixed to the valve tube 12 by fixing screws 10 to effectively control the fixing time of the valve tube positioning device, so that the rotating connector is in cooperative contact with the well wall, thereby driving the displacement of the sliding component 2. The connecting components are provided in two symmetrically arranged sets. The sliding component 2, the fixed component 11, and the two sets of connecting components are connected to each other to form a rhomboid structure. Specifically, each set of connecting components includes an elastic connector and a rotating connector. There are two elastic connectors. One elastic connector is hinged to one end of the fixed component 11 and the rotating connector at both ends by two small bearings 9. The other elastic connector is hinged to the sliding component 2 and the rotating connector at both ends by two small bearings 9. As the casing valve tube 12 is lowered to the drilling depth, the rotating connector presses against the well wall to ensure that the casing valve tube 12 is positioned at the drilling center axis in the deep burial formation; the vertical pin 3 remains intact during assembly, while the small bearing 9 restricts the rotor bearing 8 from sliding along the outer casing 6; as the lowering depth gradually increases, the self-weight pressure pushes the pulley 7 to compress the compression spring 4, and finally the self-weight pressure, together with the pulley 7, contacts the bottom of the well wall.

[0019] Preferably, the weight of the sliding component 2 is set to 5 kg to prevent buoyancy from causing displacement before the casing material solidifies.

[0020] Preferably, the thickness of the semi-circular steel mold is set to 3-4mm (specifically, in this embodiment, it is preferably set to 3.5mm), and the material is high-strength steel with a yield strength of 400-500MPa (specifically, in this embodiment, it is preferably set to 450MPa).

[0021] The thickness of the steel mold is set to 5-6mm (specifically, in this embodiment, it is preferably set to 6mm), and the weight is set to 5-10kg (specifically, in this embodiment, it is preferably set to 5kg).

[0022] Preferably, the diameter of the small bearing 9 is set to 2-3 mm (specifically, in this embodiment, it is preferably set to 2.5 mm).

[0023] Preferably, the vertical pin 3 is made of high-strength steel with a shear strength of 100-200MPa (specifically, in this embodiment, it is preferably set to 150MPa) to ensure assembly stability.

[0024] Preferably, the fixing screw 10 is made of brittle steel with a shear strength of 100-200MPa (specifically, in this embodiment, it is preferably set to 150MPa) to keep it intact during the lowering process.

[0025] Preferably, the elastic connector includes a compression spring 4, a metal support 5, and a housing 6; The two ends of the metal support 5 are respectively connected to the two ends of the outer shell 6. The compression spring 4 is sleeved on the metal support 5; The outer shell 6 is fitted onto the compression spring 4, and the outer shell 6 is fixed to the sliding assembly 2 by welding to provide protection and prevent the compression spring 4 from being over-compressed and causing failure.

[0026] Further preferably, the metal support 5 is a high-strength steel structural component, and the thickness of the metal support 5 is set to 3-4 mm (specifically, in this embodiment, preferably 3.5 mm), and the yield strength is set to 450 MPa. Compared with traditional positioning materials, it has higher rigidity and support capacity, and the moderate thickness facilitates uniform deformation under the pushing of the sliding component 2. Even more preferably, the material of the metal support 5 can be adjusted according to engineering requirements, for example, by adding alloying elements to improve fatigue resistance.

[0027] More preferably, a plurality of built-in ball bearings 1 are provided on the inner side of the sliding component 2; the plurality of built-in ball bearings 1 are arranged in a circumferential array along the inner wall of the sliding component 2; the rotation direction is guided by the plurality of built-in ball bearings 1 to ensure that after rotation, they are tightly attached to the inner wall of the valve tube 12, and the outer outer shell 6 provides additional protection to prevent excessive compression from causing structural failure. Specifically, the diameter of the built-in ball bearings 1 is set to 5-8mm (specifically, in this embodiment, it is preferably set to 6mm), and the material is set to high-hardness steel.

[0028] More preferably, the wire diameter of the compression spring 4 is set to 1.5-2mm (specifically, in this embodiment, it is preferably set to 1.8mm), the elastic modulus is 180-200GPa (specifically, in this embodiment, it is preferably set to 190GPa), the compression strength is 0.3-0.5MPa (specifically, in this embodiment, it is preferably set to 0.4MPa), and the compression rate is controllable to ensure uniform compression under its own weight pressure.

[0029] More preferably, the outer shell 6 is made of hard steel, and the thickness of the outer shell 6 is set to 2-3mm (specifically, in this embodiment, it is preferably set to 2.5mm).

[0030] Preferably, the rotating connecting member includes a pulley 7 and a rotor bearing 8; The rotor bearing 8 is mounted on the pulley 7, and the rotor bearing 8 is hinged to the elastic connecting member. The pulley 7 is used for sliding connection with the inner wall of the well; The sliding component 2 pushes the elastic connector to compress, thereby increasing the contact area between the pulley 7 and the well wall, which helps to enhance the stability and positioning accuracy of the valve tube positioning device, while preventing the valve tube 12 from shifting or tilting.

[0031] More preferably, the diameter of the pulley 7 is set to 10-15cm (specifically, in this embodiment, it is preferably set to 12cm), and the material is wear-resistant steel.

[0032] More preferably, the diameter of the rotor bearing 8 is 5-8cm (specifically, in this embodiment, it is preferably set to 6cm).

[0033] The working principle of the above-mentioned valve tube positioning device is as follows: The contact path of the pulley 7 coincides with the compression boundary of the compression spring 4. Some boundaries do not completely coincide. At this time, the sliding component 2 slides further due to the contact of the pulley 7. However, the assembly of the vertical pin 3 will consume some contact energy. Therefore, the upper sliding component 2 should be made of a metal material with a large self-weight. Its self-weight provides the potential energy for the compression spring 4 to compress and make the pulley 7 stick to the well wall, further improving the cooperative contact force between the pulley 7 and the compression spring 4.

[0034] During the compression process, the compression spring 4 gradually expands and compresses. The compression spring 4 has moderate strength relative to other components, and the compression rate is controllable. Under the contact action of its own weight and pulley 7, the compression spring 4 gradually becomes fixed. The compression boundary formed at this time is defined as the compression boundary of the compression spring 4.

[0035] Due to its own weight and the contact action of the pulley 7, the compression boundary of the compression spring 4 continuously expands, and the strength of the compression spring 4 continuously adapts. At this time, the compression spring 4 is squeezed outward along the normal direction of the compression boundary. With the action of contact, compression and squeezing, the intensity of this combined action is greater than the remaining elasticity of the compression spring 4, and the compression spring 4 undergoes fixed compression. This process marks the complete fixation of the central positioning bracket.

[0036] During continuous contact, the compression spring 4 undergoes fixed compression. The remaining compression spring 4 outside the compression boundary is compressed and then pressed tightly against the well wall by the weight of the outer shell 6. It also squeezes the well wall through compression energy, and some of the pulleys 7 with high kinetic energy are squeezed out of the external formation along with the compression spring 4.

[0037] The compression spring 4, under the squeezing action of its own weight, comes into close contact with the well wall. The pulley 7 and the outside of the sleeve valve tube 12 form a stable support chamber. The weight accumulates in the stable support chamber until the pressure exceeds the compressive strength of the outer casing material. At this point, the outer casing material is fixed, forming a uniform ring channel, thus achieving the purpose of controlling the ring formation.

[0038] If problems arise during the casing pipe 12's descent, it can be disassembled by lifting the pipe from the drilling rig, allowing for the detachable fixing of the central positioning bracket. The fixing screw 10 is designed with material strength that allows for easy disassembly under lifting force, while remaining intact during descent, ensuring the stability of the entire structure during the descent phase. If problems occur during casing descent, the integrated central positioning bracket can be disassembled after lifting the pipe, allowing for the recycling of its components and reducing material waste.

[0039] The outer shell 6, the metal support 5, and the sliding component 2 are a whole. The outer shell 6 is fixed to the sliding component 2 by welding through the metal support 5. The rotor bearing 8, the compression spring 4, and the front pulley 7 are independent wholes. Therefore, the weight of the upper sliding ring and the pulley 7 contact the pulley 7, thereby driving the compression spring 4 to compress, so that the compressed spring 4 is stuck against the external well wall.

[0040] Example 2: See Figures 1 to 5 As shown, the present invention provides a method for positioning a valve tube using the valve tube positioning device as described in Embodiment 1, comprising the following steps: Step 1: Assemble the valve tube positioning device as described in Example 1, and pre-position it on the outside of the valve tube 12; The valve tube 12 is lowered by the surface directional drilling rig, and the fixing component 11 is fixed by the fixing screw 10. Step 2: Continue lowering the sleeve valve tube 12. As the lowering depth gradually increases, the self-weight pressure of the upper sliding ring pushes the pulley 7 to contact the well wall. The pulley 7 drives the rotor bearing 8 and the sliding assembly 2. The sliding assembly 2 pushes the compression spring 4 to compress. The compression spring 4 abuts against the metal support 5 and is tightly pressed against the well wall, thus fixing the center positioning bracket. The pulley 7 group presses against the well wall, controlling the sleeve valve tube 12 to be located at the drilling center axis position, completing the positioning. Step 3: After the lowering is completed, if there are any problems during the lowering of the sleeve valve tube 12, the sleeve valve tube positioning device can be disassembled after the tube is lifted, and its components can be recycled to reduce material waste.

[0041] Optionally, the sliding component 2 has a lower weight of 5-10 kg to prevent buoyancy from rising up the sliding component 2 before the shell material solidifies during the filling process.

[0042] Optionally, the compression boundary of the compression spring 4 is determined by the pushing and self-weight contact of the sliding component 2, and its expansion range can be adjusted according to the downward pressure.

[0043] The above description is merely a preferred embodiment of the present invention and is not intended to limit the invention. Various modifications and variations can be made to the present invention by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A valve tube positioning device, characterized in that, It includes a sliding assembly (2) and a fixed assembly (11) arranged at intervals along the central axis of the sleeve valve tube (12), and a connecting assembly for connecting the sliding assembly (2) and the fixed assembly (11); The sliding component (2) includes a first steel mold and a second steel mold, which are connected to each other by vertical pins (3) to form a sliding ring structure; The fixing component (11) includes two semi-circular steel molds arranged symmetrically to each other. The two semi-circular steel molds are connected to each other by vertical pins (3) to form a fixing ring structure. The fixing ring structure is fixed to the valve tube (12) by fixing screws (10). The connecting components are provided in two symmetrically arranged sets. The sliding component (2), the fixed component (11) and the two sets of connecting components are connected to each other to form a rhomboid structure. Each set of connecting components includes an elastic connector and a rotating connector. There are two elastic connectors. One elastic connector has its two ends hinged to one end of the fixed component (11) and the rotating connector, respectively. The other elastic connector has its two ends hinged to the sliding component (2) and the rotating connector, respectively.

2. The valve tube positioning device according to claim 1, characterized in that, The weight of the sliding component (2) is set to 5 kg; The vertical pin (3) is made of high-strength steel with a shear strength of 100-200MPa; The fixing screw (10) is made of brittle steel with a shear strength of 100-200MPa.

3. The valve tube positioning device according to claim 1, characterized in that, The elastic connector includes a compression spring (4), a metal support (5), and a housing (6); The two ends of the metal support (5) are respectively connected to the two ends of the outer shell (6); The compression spring (4) is sleeved on the metal support (5), and the two ends of the compression spring (4) are respectively hinged to the sliding component (2), the fixed component (11) and the rotating connector; The outer shell (6) is fitted onto the compression spring (4).

4. The valve tube positioning device according to claim 3, characterized in that, The compression spring (4) has a wire diameter of 1.5-2 mm, an elastic modulus of 180-200 GPa, and a compression strength of 0.3-0.5 MPa.

5. The valve tube positioning device according to claim 3, characterized in that, Multiple built-in balls (1) are also provided on the inner side of the sliding component (2); the multiple built-in balls (1) are arranged in a circumferential array along the inner wall of the sliding component (2).

6. The valve tube positioning device according to any one of claims 1-5, characterized in that, The rotating connecting component includes a pulley (7) and a rotor bearing (8); The rotor bearing (8) is mounted on the pulley (7), and the rotor bearing (8) is hinged to the elastic connecting member; The pulley (7) is used for sliding connection with the well wall.

7. A method for positioning a valve tube, characterized in that, Includes the following steps: Step 1: Assemble the valve tube positioning device as described in claim 6, and pre-install it on the outside of the valve tube; The casing pipe (12) and casing pipe positioning device are lowered by the surface directional drilling rig. The fixing component (11) is fixed on the casing pipe (12) by the fixing screw (10). At this time, the vertical pin (3) remains intact, the small bearing (9) restricts the rotor bearing (8) from sliding along the metal shell (6), the pulley (7) has not yet fully contacted the well wall, the compression spring (4) is in the initial state, and the sliding component (2) is ready to bear force by its own weight. Step 2: Continue to lower the valve tube (12). As the lowering depth gradually increases, the self-weight pressure of the sliding component (2) pushes the pulley (7) to contact the well wall. The pulley (7) drives the sliding component (2) to move through the rotor bearing (8). The sliding component (2) pushes the compression spring (4) to compress, and the compression spring (4) abuts against the metal support (5) and is closely attached to the well wall under the guidance of the built-in ball (1) to form a stable support chamber; The pulley (7) rests against the well wall, and the control sleeve valve pipe (12) is located at the center axis of the drilling, thus completing the positioning.

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